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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dfbcdd59b1f17d97341fc8e8e087b699ac45615d7a3e563a01a29930a19dddb9' 
  AND token = 'rr7es9L2qBn6ks4jeLw3KDxVaP/4YYxgFpcJV7tkEHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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