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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c37d08258bf34e7ee9e269d9b692561d8ac7acf0c4de930ec8dc615198eb43fd' 
  AND token = '2rJ8hHcHiBenOx2nfaTV32wSoRyFar+ht6kT9SduW4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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