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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '20844fc0bee8f6c0b29372e7b3f9b65b6bfa8d5e8c5cc1284db0cf3509098c96' 
  AND token = 'lIkyjDi/rxok1csEEq7Hu1cbNeBukE8tbcsFxw4HSWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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