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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3f64c29d75078ebe7c7553ce19796b3f3d9a1d3f8ad9d2aff82584b2b6ed0632' 
  AND token = 'FBei0EDQLX43Jthnn5M8bcX+AZHfcipf7n2Sw0Dqsm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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