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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b2987672645826a9de33e288f4e6934b946bf4843dbc7e2e389052b47e971944' 
  AND token = 'TWtavKdxD7F7fzAYVhsGdfscAFnvnarTG+0tkHnTgek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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