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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f591c3a593962a8227d47fcfd9dec4d43193e6c197ea0b326cf117277923186c' 
  AND token = 'emFh5UHRmR+Lb+f5JRwS516sFE3Iq94a96pb2Ia2OfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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