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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'be1a9dc1e3baf04259d248ae2faf53b0c776e20dc80952ee30fbe430b31143d6' 
  AND token = '/QQ5cZjt/5Sd8Az13yUmds4gSJtwkubkZWjuYMKFK8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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