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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd7b0647a0534bd9e17573f815458f86e144cb566bd43f21907253c2f62080602' 
  AND token = 'g1emNim3+LPNsqeEEDxjLNMXxgFN5DU3ua4ToVYhVoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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