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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2f900dccc8653f433ed9e0327c0f7aa09021709bc43235fce522be20e1ba46bc' 
  AND token = 'lbwAx4WR1lgOrAQQqiogUswq8s30XLL62Pl/PomNGMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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