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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cf192aaf5b4d83540977e59b388430739245e7b906b5ca9badb899dc5e77d3c4' 
  AND token = 'yx+lPWMEnNcgCDATOC9CW5X1Qj/EB/Yg2DEvWVr4jtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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