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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '65608c759d9108fdab8d5bacbaadd286cf65b864b937f2c7b565c7a2d2b1c6f8' 
  AND token = 'j0g5SollSW8feMXoht1EnRYViQj3l5Nj85HBYcEVeHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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