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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6bdf41a53f42d97212ad7a0876bfea94f9a64712e4b23083ff5cf332df62ec08' 
  AND token = 'tFuFapxRBk1khvm9AeKpnSbOZae12d3mJnj9F2e8U6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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