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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1a30587c8773eee3f6436bac793774ac8eb62dbdd8605a979f9a2286b619d9a8' 
  AND token = 'RvHXSyeAW4aEJv1gW/lQLxxHIROKfWzMntNJeCSubHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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