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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eac98d2f11b24fa194e7a9e08d1b7efbf687b50c3deed6418c0af998aeeb16c9' 
  AND token = 'cVzsCbRj2SlwGDXUsbk6FJg9AR3iJ4Qx04q0Oi7UVdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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