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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e13466156b7093a60e43d86783f76231aae15d6faf764eea22a2ff785daf5432' 
  AND token = 'HUIVB2gnydAGZYSHt2MonuE6OmvGQUkxvFIUBVwS6nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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