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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ac9da76f8eeffd11211f39416854e0e4e1847caa3e0f0e497d4e5a313ee38b0d' 
  AND token = 'Nr/q5wv2U48TaqceQQSpj2ky8chN0e6y1ilvRGrOgo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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