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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a33ca6c6fa40471fbaf5a640c3d26a2eccbafc1ebb1cf390e14f7aaf9fae97a4' 
  AND token = '4rmrWRD0URzqvXG1IrqxTPl82pwfsnyG2itv2LBOIes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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