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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b347e08fd14225f9b8096d062affa89ef0bc586550f49ba916042813a6b1015a' 
  AND token = 'f107PZlv7ntD+dnID0ix9SbOcqgRbC974Rhz+lu+pds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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