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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7de5052db71974d0eebbcd2c7be2aa847a4fab4e66acc7da66e827b4b2828cf3' 
  AND token = '2CQ70WmYAzXeGzEa2VcydhBYuPF4dduW9N9np0ohUQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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