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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '622a4e7837d7f8a13c5f4377150426549992ec0a4f662e4389929c438241e36d' 
  AND token = 'ia/0cC+6CjjTwAqYeo9BQjyCxMCAXY6jnlmwklqHv34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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