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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fed9c35610db3f0ba174c4d23cec056d972365d78398a59371d778739e8fc892' 
  AND token = 'D4e48xF9/jOJ7PCYLRgVZ4cOIEg32Lic2jo3XLoSoTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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