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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7df09b39c290d8d99e77162473e94e88076e7639f31bf5ab153e553427f17606' 
  AND token = 'uP+AEfnCzWyiNRNnYPtEfL/O+pc7QWd2KUOeOZUsS/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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