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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e0f959dfc58b0412926f982b0bffcd7fe5c6ea688c48e91c1b2689ec0e55b650' 
  AND token = 'KbhxTRAGaOC5GoaQPK0TVXYM44P4tUr5+md6HvoJBj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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