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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '44a93bd16fd216e5b5d816626318ad8b264c8a3c0d2f7ffe02efe683f10645e3' 
  AND token = '7elPZdAjKbztwBi0B54iF2yZISKJix1g7ZiYMczHmXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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