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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '98743689ce05c25c039611ff0d360420de275da2d29a65f312b91375a452d692' 
  AND token = 'RtZAi8bXC7WU8AWoeVtbm5WSxi/ql2WYlQ5ls6jZ8xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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