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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '68de9abc345d8b149ccda70e19bcaff67c77146447448edccb293fbb5772d475' 
  AND token = '4ujdTfe603Nv710SiwLaIl3ZcNjgbkH8bytkOydZquE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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