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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e095f4d20281b6e214ed12837a454a065068802d79a9d4b57fba016cd944cd9e' 
  AND token = 'BlFtioqQNCr92fQna4VJaQIyh3n2fbz0on988+XKnAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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