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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '88fb9a0106f0b9008e75e7f905ac2e0eb08211ac10330943de1a0eefa21a95e8' 
  AND token = 'UtB6V3BEOIGajXaNP6SVTf6W6QDvPMnC858iL+WLK6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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