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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '514ce53af05c44df0eacfc0c0ee8352f3b62d317db0ec41b7d882599d7095e47' 
  AND token = '5oW0xY5uVBvuoRQt2ZylcDt7mwQAO6yAv7ceVQVoBl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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