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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0467114fc9b3c7e5570b7a06f459ccb8cec3cef4c7225fbfc5556f02e5ac4b55' 
  AND token = 'hdoCoWREHkUBnMDAkLuRzzPLqXc+TvhnVwAysn8vGG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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