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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6ff3604f7163b991b7a702b1fdf8ac09797a0cd7b55fe368d1d213905236d29b' 
  AND token = 'voTGoXBfiov7EnVUlzjBIsymqFO5Ff3yw7ld1pAKpoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}