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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fb5e7785f51e97c8d3b3074312e29cd4480f615f5d1602eb32401f32d439fa22' 
  AND token = '1fu/CyWx0z3xLErfRgMQhLy8+ok4l6Oq7OY3s8RysIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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