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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ad2ba8b9bfdab680475744c1b7d0af28990d7644a1d0df836632fb1bc4fcaaed' 
  AND token = 'aC2ex2HNCEK2rGPv7/FuKzwqN31FRyOowrAMAQxNums=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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