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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '372535548e15bcf7704b45d75c0e163f6df25e90e595f89ad4cae2e92238aa39' 
  AND token = 'Z4+RcakvbOlmIu5NNm5lQWkb6jr5IRRaV6RA0aTh88s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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