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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fde33da43d25be43a96bd3662c880ab7c1f099eebcd848a29f1b766424092c89' 
  AND token = 'rfha46RB5sPQgJDeisCnzEW0eSz0y9CgVO4FbRrvyZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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