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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '35e751f1a7fa43f349f54f5b94f1e09be22f307a734e062c177a8fdb6ee2fc53' 
  AND token = '5nxCQhvmtSZWzs/CGILsYkMISd9I3dyYbEte8SR5kh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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