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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5c8bc9f2b7fa29ea8d768fbe8797876093d973f90ce3a3c0e754a31cd8f61134' 
  AND token = 'HMFfcmLriHF6K13Q1oPvOqbpO/GWrXmTCkF0WjCits8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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