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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b7507e2bde28a7cab63398e4f5f291443759612c0844d342d44c844d62326b24' 
  AND token = 'k2cJbgJimLP7YYOf4bD1ouvHm5lA2wKSnTjxov50GbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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