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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9ae73ce1f7c92170236fdd5832475b61a982f2a342309e17ef5c6bf6f8025fb1' 
  AND token = 'etVFm5VtOHpnn2knLNos9mt1QaEIx2Cp102hRhkCPX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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