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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd298fe42d1121e0e6c1a2885e9b19c77bf3ebfb5690052d3515f0d9f858390ef' 
  AND token = 'zT4x2045B+HYqhHoH7ScNnrwcbzc3Bhg7Lc5KU6Y1zM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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