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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8ac4e08bd5dfbd501937058a89c022bb9c48e6ebdbc561434b417357580a7049' 
  AND token = 'kvsJyqv0GQFsbCiEJwNELFChaHePtEFQLO30PmVjuF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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