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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f77e0a62fb5163a8a71138298597552ae0543798e51095021a06f8321fdfd53c' 
  AND token = 'Fpc/oSq3qG76u2M/Czf8S5KeTaGOR+rKLxPfh/0udjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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