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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f9e58947fcc49a8d5229b803b8f22d55ff6eabb25a2aaeaf69c70b2c1125cf5c' 
  AND token = 'GswilhIu4maE6TLuz2bwt+lpXHwIo54ltqOmc3SlZNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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