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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4618d99c56b7da68b4625168e23e4f6feb8d67256e7d0ba78d0d44ee4b862b7d' 
  AND token = 'NiJ7yfeWNEyDgnNV27xwJl/rHEu60RnmY1jZ3KUR+GA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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