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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4abfbdc67b71f6986b0ec0c06cfce014137711d1a8f501dea166a6acabdbf64c' 
  AND token = 'TolEfJ+H9eBE0gOab6Kuy0fhbugxZCQczetIV2z1DC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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