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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eb3a3949174321e74ce5a061f39f4140340ae7f2601d9c5c9a7430d992dfe466' 
  AND token = '97+L05BLnMTnwFnv1y1XvXir8dJA7/dyD++OaggGyXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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