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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f7077339d775188e9883bfea7a3e373ce1e65579cc9a1c1843e98f2d3ce4d867' 
  AND token = 'DJkudVGXxVVb2rkC1vEq9Dk26AQ80VRb4PTBf+zxkXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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