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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5c313fb0b49b5288e9cc4080deffb0d1f57c6ce5d90965f79b3223285a5272ef' 
  AND token = '1qS4cgnZwq5M5SA+2+2/z9FyceORNZMVp6pauzPdSmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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