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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b16aaab4bb4a00eb3e5c69afbd045a9234bacdb59bc6db8a895fad804d211d60' 
  AND token = 'Q7V6vTQFQQZVD86WHwrH3ov0Fl9ikrwDFJnIM+BQz64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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