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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b9ae4cecccc257c6c0f419b3ad102a853653531a87364ad2d061115b0c3155f5' 
  AND token = 'hM21XJC+swMZ2AsDUPC1+yOoGJZhd1cyaBDgaDGaMpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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