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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a9aa1d4e4fafa7410cf64661f42df88aa02f2fe408ea8b30f9f2a1dfb398af91' 
  AND token = 'l32i0w7XuSvWRBYCTGdn2vepStbI3eOlGDiopRLeSjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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