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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f48f7ab4290de5f1d1be3192fec13012dc72a0f1352b6446dde85c09852cde5f' 
  AND token = 'XXbL5LMF64Qv53H1i8/7e+nqt8cCCNCaufHCXjmwobw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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