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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2f37ce30d8761df75cf9ffce557ded03aa964ede48de300dc7c4af9f617564e8' 
  AND token = 'KpS2YyV3UqQ39LOxfZuxgs9VG5qkZnOPcFZel+KYSyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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