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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '38c8cbc8ddb4eb5e075382129ba59d3cc54493c7bde6d941f23ef700702db80c' 
  AND token = 'tLHnnu+ey88IFQ6SVO3gQAb/frsj/dU4Gl6rkgNUWVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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