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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e88118c39816b62b645420c4e6fd772f700b98a90ef4fdc800c719f0b8a134f2' 
  AND token = 'mei0Nw3rJ4E6er9APdSURpLGz2IFL57dLbHIod+bZQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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