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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1804288567adf7e47b688c7da162e3d85b5db271fa30887810e2d6e9bc80db77' 
  AND token = 'uj4zJkML2FJqaZUDQwMb8FIqDbOL/s7sOrMdKe6oYWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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