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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '42033de0bb21344023a39f18ef28616705b3552fbc7358a87167d0cff83aafa3' 
  AND token = 'VO9zb28v6vpPoNItFAaNTUhL1Iiwe6DH1FKyqO1PDBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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