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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eac190a1e4d61e5f464adc957298513af449542268cadec17e1d067dbca04ecc' 
  AND token = 'T+uNuveMiiNXkjXPaO4iYMhnrK7aHdNQSsrf8IdW9ZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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